如图4所示,一定值电阻R0与最大阻值为40Ω的滑动变阻器串联在电路

如图4所示,一定值电阻R0与最大阻值为40Ω的滑动变阻器串联在电路中,闭合开关S,当滑动变阻器的滑片P滑到最左端时,电流表的示数为O3A;当滑动变阻器的滑片P滑到最右端时,电流表的示数为O1A。则定值电阻R0   Ω,电源的电压U    v

答案

20,  6

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